Joomla! lets you use Search Engine Friendly (SEF) URLs for your website, which can help improve your search engine ranking.
Because of our hosting accounts' configurations, though, there are a few more steps required to enable the option successfully. You must enable RewriteBase in your hosting account's .htaccess file.
To Enable Joomla! SEF URLs
- Log in to your Joomla! control panel (http://coolexample.com/administrator, where coolexample.com is the domain name and directory where you installed Joomla!).
 - From the Site menu, select Global Configuration.
 - In the SEO Settings section, from the Search Engine Friendly URLs field, select Yes, and then click Save.
 - Using your hosting account's editor, edit your account's 
.htaccess file. - Locate the line of text 
# RewriteBase /
 and delete the # from the line of text. - Save your changes.